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T'Khut – Volcanic planet that shares an orbit with Vulcan.
T'Lani Prime – Homeworld of the T'Lani species.
T'Lani III – World belonging to the T'Lani species which was wiped out in 2370 in a war against the Kellerun species.
T'lli Beta – Destination of the USS Enterprise-D before it became trapped in a cosmic string anomaly.
T-Rogoran – Home of the Dominion allied T-Rogoran species in the Gamma Quadrant.
Tagra IV – The dying homeworld of the Tagran species, whose careless industrialization began destroying the atmosphere. On stardate 46192.3, the USS Enterprise-D undertakes a clean up mission of the atmosphere which proves fruitless. However, young intern crewmember Amanda Rogers (who was unknowingly a member of the Q) uses her godlike powers to save the planet.
Tagus III – Homeworld of the secretive Taguan species who have a rich historic culture studied by the Vulcans, (the only species the Taguans allow to visit their world). The Federation Archaeology Council holds an annual symposium in orbit above the planet.
Takar II – Delta Quadrant homeworld of the Takarians species that laid at one end of the Barzan Wormhole.
Takara – Homeworld of the Takaran species (not to be confused with the Takarians), the planet has an inhospitable environment to most humanoid life.
Talarian homeworld – Home of the Talarian species. The Enterprise encounters a disabled Talarian ship adrift in the Neutral Zone. (At one point in the episode, Capt. Picard describes the ship as "Taralian," but the subtitle track spells the name "Talarian.")
Talax – Homeworld of the Talaxian species. The Talaxians were known as the Talax-ilzay in their "old tongue."
Tallonian homeworld – Quark is accused of dealing with Markalian smugglers to acquire Tallonian crystals, illegal anywhere away from the Tallonian homeworld.
Talos IV – Quarantined homeworld of the Talosian species, strange humanoids who can create realistic illusions. Star Fleet General Order 7 quarantines the entire region against any and all contact under penalty of death because of the Talosians' abilities; any communication supposedly originating from the region is to be assumed false, without exceptions.
Tamar – Homeworld of the metaphoric speaking Children of Tamar species.
Tandar Prime – Planet in the 39 Tauri system. Homeworld of the Tandarian species.
Tantalus – A Federation prison colony where the warden, Dr. Tristan Adams, is discovered conducting cruel psychological experiments on the inmates. The planet is also referred to as Tantalus V.
Tanuga IV – The cloudy homeworld of the Tanugan species, who have a harsh "guilty until proven innocent" justice system. Commander Riker was accused of murdering the Tanugan physicist Dr. Nel Apgar, who was experimenting on converting Krieger waves and had hoped to sell his Krieger-wave converter to Federation enemies as a weapon; the UFP's interest in the Krieger-wave converter had been primarily as a power source.
Tarakis – Delta Quadrant planet once settled by Nakan colonists. The planet was to be evacuated, but the colonists were instead slaughtered by the rescue forces sent to help them leave. A memorial to the massacre remains on the surface which contains a synaptic generator and causes those who stand near it to receive flashes of images and the intense emotions of the event.
Taranko colony – System with a Federation colony. In 2370, the USS Enterprise-D took on medical supplies destined for the system from the USS Lexington.
Tarchannen III – A swampy planet with a thick atmosphere visited by the USS Victory in 2362, to investigate the disappearance of 49 scientists from a Federation research station. Geordi La Forge was part of the investigating team. In 2367, La Forge and members of his search team were mysteriously drawn back to the planet and underwent a strange metamorphosis, turning into invisible amphibious beings that are native to the planet. The beings reproduce by infecting other races with a genetic parasite.
Tarellia – The former homeworld of the Tarellian species who fought a civil war with biological weapons that wiped out nearly all of them. Some escaped into space looking for a cure.
Taresia – Class M homeworld of the Taresian species. The Planet is located in the Delta Quadrant and is populated by 90% females.
Tarlac homeworld – Home of the Tarlac species. It is one of three planets ruled over by the Son'a Solidarity.
Tarod IX – Site of a Federation post near the Neutral Zone, which Capt. Picard believed was destroyed by Romulans.
Tarok – M-class moon of a Delta quadrant gas giant, used as a training site by the Ogla sect of the Kazon. Chakotay and a Kazon boy named Kar were marooned there.
Tarquin's Planet – Planet whose sole inhabitant is the alien named Tarquin.
Tarsus III – Location of Starbase 74, where the Enterprise-D drydocks for a computer upgrade.
Tarsus IV – Federation colony that was home to some members of James Kirk's family, who were killed in a mass genocide ordered by the colony's ruler Kodos. Kevin Thomas Riley (Bruce Hyde), one of James Kirk's junior personnel, was born there and lost his family in the massacre.
Tartarus V – Planet where Vash goes off to explore the ruins.
Tau Alpha C – Star system of the home to an enigmatic race of beings which includes one known only as The Traveler. At maximum warp speeds it would take over 120 days to reach the planet from Starbase 133.
Tau Ceti Prime – Planet in the Tau Ceti system. In 2368, Vice Admiral Janeway, (Capt. Janeway's father), drowned on the planet.
Tau Ceti III – Planet where Picard first met his friend Captain Keel. Non-canonical sources identify this planet as Kaferia and describe its inhabitants as insectoid bipeds who prefer maintenance of an alliance with the Federation to membership in it; in these non-canonical sources, they are also credited for eugenically tailoring some of the most delicious fruits known to Federation society.
Tau Ceti IV – Home port planet of the simulation ship Kobayashi Maru. Planet's name was indicated on a readout screen.
Tau Cygna V – Colony where in 2274, the SS Artemis crashed on the surface and the survivors started a new civilization. In 2366, the Enterprise-D was assigned to remove the lost colony of humans against their will when the planet was annexed from the Federation by the Sheliak species. The planet is bathed in radiation harmful to humans but the colonists developed a natural resistance over time. To handle the relocation effort, Lt. Cmdr. Data was sent to planet since he was immune to the radiation effects.
Taurus Ceti IV – Planet where Captain Janeway got her dog, Molly, as a puppy from a pound. Note:The planet most likely should have been Tau Ceti IV since Janeway's father was from Tau Ceti Prime.
Taurus II – A desolate planet near the Murasaki 312 quasar where the Galileo shuttle crashed. The planet is inhabited by primitive hostile giant humanoids.
Taurus III – Location of Jem'Hadar facilities.
Teplan system – Kira, Dax and Bashir answer a distress signal coming from one of the planets in the Teplan system in the Gamma Quadrant.
Terlina III – Uninhabited planet where Dr. Noonien Soong and his wife Juliana O'Donnell fled after the destruction of Omicron Theta colony to continue their work on androids.
Terosa Prime – Planet visited by Dr. Gideon Seyetik and his wife Nidell. An accident there caused Nidell to lose control of her psychic powers and an alter ego, Fenna, was created. Fenna caused problems aboard DS9.
Terra Nova – also known as Eta Cassiopeia III, was one of the first Earth-colonized planets. Terra Nova was Earth's "great experiment," and was an early human colonization mission, which set its sights on the closest habitable planet from Earth. The world was 20 light-years from Earth, and the early warp drive colony ship heading there took 9 years to reach it. All adults from the original colony were killed after a radioactive asteroid struck the planet. The children survived by going underground and living in caves.
Terrellian homeworld – Chakotay spars with a Terrellian on the holodeck.
Tessen III – Planet threatened by an asteroid that the Enterprise-D tries to push off course with a new tractor beam system.
Tessik Prime – Planet visited by the Enterprise NX-01 in 2152, where a crewman contracted Rigellian Fever and started an epidemic forcing Dr. Phlox to inoculate the entire crew.
Tethys III – A gas giant planet in the Tethys system. Data faked information regarding the system to hide the existence of the xenophobic isolationist Paxan species, a race who did not want to be known by outsiders. The Paxans erased the crew's memories save for Data, because he was inorganic, but made him vow to never reveal their existence.
Thalos IV – Planet known for its black market activity.
Thanatos VII – Planet where in 2073, a defective warp core conduit installed aboard the Enterprise-D was manufactured. Unfortunately, the conduit was infested with interphasic organisms which caused the warp core to fail.
Thasus – Homeworld of the discorporate Thasian species and inhospitable to most other races. The crew of the USS Antares finds a teenage boy named Charles Evans (Robert Walker Jr.) stranded on the planet. The Thasians had granted him psycho-energetic powers for survival, which, because of his lack of maturity and the fact that he was going through adolescence—and its corresponding identity crisis—when they were discovered, proved to be as dangerous as if he had been a child with a fully loaded handgun. Because the Thasians were discorporate, Evans lamented, just before being taken back to Thasus, "I-I can't even TOUCH them!!!"
Thelka IV – Planet from which comes a special dessert Picard wanted to serve to Nella Daren, a Commander he was "dating" for a time aboard the Enterprise.
Thera – Homeworld of the Xyrillian species. The Xyrillian female Ah'len took Trip to an image of Thera on her ship's holodeck.
Theta 116 VIII – Gas giant planet investigated the by the Enterprise-D after having traced the ancient NASA spacecraft Charybdis here. An unknown alien intelligence recreated a 20th Century hotel/casino from a novel calledThe Hotel Royale on a plane of frozen methane for the craft's only surviving crewmember.
Theta VII – The Enterprise is scheduled to meet the USS Yorktown to carry perishable drugs to the Federation colony on Theta VII.
Tholia – Class Y Homeworld of the Tholian species. Benjamin Sisko gives Kasidy Yates a gift of Tholian silk which he got from the Tholian ambassador. Data relates that Will Riker calculated a sensory blind spot on a Tholian vessel and hid within it during a battle simulation.
Thurasia – Planet where it only rains twice a year, producing Thurasian Rain Water, a delightful drink which Guinan served Counselor Deanna Troi.
Ti'Acor – Klingon asteroid belt containing a military base.
Tiburon – Planet mentioned as the homeworld of Dr. Sevrin. It is the homeworld of the Tiburonians whose name for the planet is Simeran. It is in the Omega Fornacis A star system.
Tilonus IV – A planet fallen into anarchy that Riker is ordered to infiltrate.
Time Planet – An unnamed planet that had been deserted by an advanced species who created a doughnut-shaped device, a sapient time portal calling itself "The Guardian of Forever," that would transport a being to any place and time they desired. It was first discovered by Captain James Kirk of the USS Enterprise at an unknown stardate in which Dr. Leonard McCoy accidentally stumbled in, sending him to 1930s Earth. They retrieved McCoy, and left the planet with no definite coordinates so that no ship could repeat any accidents.TAS, however, said that in the animated installment "Yesteryear," strictly regulated historical research was conducted there; but when Spock accidentally erased his own existence, he had to use the Guardian of Forever to undo that erasure, and finally contact with the Time Planet was banned altogether.
Timor II – Planet where the fifth-largest Ferengi controlled pergium mine resides.
Titus IV – Planet where Miles O'Brien almost stepped on a Lycosa Tarantula. He takes the spider as his pet Christina.
Tohvun III – A neutral planet near Cardassian space. Captain Picard went there in 2366 to negotiate a Federation-Cardassian peace treaty, but instead, he was abducted and interrogated by Gul Madred.
Torad V – Destination of Miles O'Brien and his wife pregnant Keiko for a botanical study, during which their runabout is damaged, and Keiko injured. The fetus of Keiko's unborn son is transferred to Major Kira by Dr. Bashir and Kira carries the child to full term.
Toranius Prime – While reliving a massacre on Tarakis under the influence of a synaptic generator, Chakotay is promised a week's R&R on Toranius Prime after he completes the mission.
Torga IV – Uninhabited Gamma Quadrant planet rich in valuable "cormaline" deposits. Captain Sisko leads a team there to determine the feasibility of establishing a mining colony so far from Federation space.
Torman V – Planet near Cardassian space where Captain Picard hires a Ferengi smuggler to take him and Dr. Crusher to Celtris III.
Torna IV – Planet where the Klingon Kor became drunk in a tavern and revealed he knew the whereabouts of the ancient "Sword of Kahless."
Torona IV – Homeworld of the insectoid Jarada species.
Toroth – A desert Beta Quadrant planet. Homeworld of the Torothan species visited by the Enterprise NX-01 in 2152. Captain Archer meets Zobral, a terrorist leader, who tries to force Archer to help him fight his political enemies.
Torros III – Planet in Cardassian space where a Cardassian-Dominion shipyard was located.
Tracken II – Maquis colony. In 2373 Captain Sisko threatened to render the planet uninhabitable unless Maquis agents hiding there surrendered themselves and their weapons.
Tranome Sar – Site of a famous Klingon battle.
Triacus – A planet with a small Federation archeology team stationed there to investigate ancient ruins of an extinct civilization. Non-canonical sources call it Epsilon Indi III.
Trialas IV – Planet where Dr. Arik Soong fled after stealing augmented human embryos to raise on his own.
Triannon – Homeworld of the Triannon species located in the Delphic Expanse.
Trill – (a.k.a. Trillius Prime) Homeworld of the symbiotic Trill species. Ensign Mayweather's family resided there for a time.
Triona – Location of a Federation colony and outpost.
Triskelion – Planet in the M-24 Alpha system, with three suns, controlled by at least three once-humanoid beings, now existing as disembodied entities in subsurface vaults, who once captured slaves ("Thralls") from other worlds and made them fight in gladiatorial games for their entertainment.
Troyius – Planet visited by the USS Enterprise NCC-1701 whose people sought peace with a warring neighbor world, Elas, through an arranged marriage.en.wikipedia.org/wiki/List